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Abstract

Radio users currently have the capability of "locking" the radio to prevent unauthorized use using a numeric code entered on the radio's keypad.

Copyright

Motorola Inc. December 1997

Country

United States

Language

English (United States)

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MOTOROLA Technical Developments

COMMUNICATION DEVICE DISPLAY COMBINATION LOCK

by Charles l? Schultz

Radio users currently have the capability of "locking" the radio to prevent unauthorized use using a numeric code entered on the radio's keypad.

The Communication Device Display Combination Lock feature utilizes the radio's display capabilities to require a more complex unlocking combination, and allows the lock feature to be implemented in devices that do not have numeric keypads. Using this type of combination in a 4x3 multi-line display, for example, is easier to remember than an equivalent 12-digit numeric password, and can offer more choices for each pass- word position.

One way in which the lock/unlock combination is realized is by selecting a displayed pattern for each line of the display from a pre-stored list, as shown in Example 1. Choices must appear in the proper sequence for the combination to unlock

the radio. Left and right arrow keys are used to scroll through the available selections for each display row. Up and down arrow keys, or other available control, such as side buttons, are used to select which line of the display is active. Another button, such as a HOME button, is used to select the displayed pattern. The displayed pattern choices can be designed specifically for the Display Combination Lock feature, or can use information already stored in the radio's memory, such as menu selections or annunciators.